data_json, data_json_with_extra_fields, data_xml
"{
  ""id"": ""a"",
  ""code"": 1
}","{
  ""id"": ""a"",
  ""code"": 1,
  ""extra"": ""ignore""
}","<some>
  <ts>{{iso (at)}}</ts>
</some>"
"{
  ""id"": ""b"",
  ""code"": 2
}","{
  ""id"": ""b"",
  ""code"": 2,
  ""extra"": ""ignore""
}","<some>
  <data>any</data>
</some>"
